Method and Apparatus for Controlling Network Access According to Ue Capability and Subscription Information

1. A method of a Mobility Management Entity (MME) in a mobile communication system, the method comprising: receiving, at the MME, from a User Equipment (UE), a message including voice domain preference information indicating an access network that is preferred by the UE for a voice service; determining, by the MME, whether a user of the UE is a Voice over Long Term Evolution (VoLTE) subscriber; determining, by the MME, whether access of the UE to the mobile communication system is allowed based on the voice domain preference information and whether the user is a VoLTE subscriber; and transmitting, to the UE, a message indicating whether the access to the mobile communication system is allowed, wherein access to the mobile communication system is allowed if the voice domain preference information indicates that only VoLTE is supported by the UE and if the user of the UE is the VoLTE subscriber.

2. The method of claim 1 , wherein determining whether the access of the UE to the mobile communication system is allowed comprises: identifying subscription information; and determining whether the access of the UE to the mobile communication system is allowed by using the subscription information and the voice domain preference information.

3. The method of claim 2 , wherein determining whether the access of the UE to the mobile communication system is allowed comprises, when the subscription information includes information indicating that a subscriber is a VoLTE subscriber, determining whether the access of the UE to the mobile communication system is allowed by using the voice domain preference information.

4. The method of claim 2 , further comprising: identifying the subscription information; and receiving the subscription information from a Home Subscriber Server (HSS).

5. The method of claim 1 , wherein determining whether the access of the UE to the mobile communication system is allowed comprises: receiving, from the UE, UE usage setting information including information indicating whether the UE prefers the voice service or a data service; and determining whether the access of the UE to the mobile communication system is allowed by using the UE usage setting information and the voice domain preference information.

6. The method of claim 1 , wherein determining whether the access of the UE to the mobile communication system is allowed comprises, when the voice domain preference information includes information indicating that only a Circuit Switched Fall Back (CSFB)-based voice service is supported, determining not to allow the access of the UE to the network.

7. The method of claim 1 , wherein determining whether the access of the UE to the mobile communication system is allowed further comprises, when the voice domain preference information includes information indicating that a Circuit Switched Fall Back (CSFB)-based voice service is primarily preferred and that a VoLTE-based voice service is secondarily preferred, transmitting information indicating that the access to the network through the CSFB-based voice service is not possible to the UE.

8. A Mobility Management Entity (MME) for use in a mobile communication system, the MME comprising: a transceiver configured to communicate with another network entity; and a controller configured to control the transceiver to receive, from a User Equipment (UE), a message including voice domain preference information indicating an access network that is preferred by the UE for a voice service, to determine whether a user of the UE is a Voice over Long Term Evolution (VoLTE) subscriber, to determine whether access of the UE to the mobile communication system is allowed based on the voice domain preference information and whether the user is a VoLTE subscriber, and to control the transceiver to transmit, to the UE, a message indicating whether the access of the UE to the mobile communication system is allowed, wherein access to the mobile communication system is allowed if the voice domain preference information indicates that only VoLTE is supported by the UE and if the user of the UE is the VoLTE subscriber.

9. The MME of claim 8 , wherein controller is further configured to identify subscription information and to determine whether the access of the UE to the mobile communication system by using the subscription information and the voice domain preference information.

10. The MME of claim 9 , wherein, when the subscription information includes information indicates that a subscriber is a VoLTE subscriber, the controller determines whether the access of the UE to the mobile communication system is allowed by using the voice domain preference information.

11. The MME of claim 9 , wherein the controller is further configured to control the transceiver to receive the subscription information from a Home Subscriber Server (HSS).

12. The MME of claim 8 , wherein the controller is further configured to control the transceiver to receive UE usage setting information including information indicating whether the UE prefers the voice service or a data service from the UE, and to determine whether the access of the UE to the mobile communication system is allowed by using the UE usage setting information and the voice domain preference information.

13. The MME of claim 8 , wherein, when the voice domain preference information includes information indicating that only a Circuit Switched Fall Back (CSFB)-based voice service is supported, the controller determines not to allow the access of the UE to the network.

14. The MME of claim 8 , wherein, when the voice domain preference information includes information indicating that a Circuit Switched Fall Back (CSFB)-based voice service is primarily preferred and the a VoLTE-based voice service is secondarily preferred, the controller controls the transceiver to transmit information indicating that the access to the network through the CSFB-based voice service is not possible to the UE.